re PR tree-optimization/52009 (Another missed tail merging opportunity)

2012-07-06  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/52009
	* gcc.dg/pr51879-7.c: New test.
	* gcc.dg/pr51879-18.c: New test.

From-SVN: r189322

gcc/testsuite/ChangeLog

+2012-07-06  Tom de Vries  <tom@codesourcery.com>
+
+	PR tree-optimization/52009
+	* gcc.dg/pr51879-7.c: New test.
+	* gcc.dg/pr51879-18.c: New test.
+
 2012-07-05  Jason Merrill  <jason@redhat.com>
 
 	PR c++/50852

gcc/testsuite/gcc.dg/pr51879-18.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-pre -fno-tree-copy-prop -fno-tree-dominator-opts -fno-tree-copyrename" } */
+
+extern int foo (void);
+
+void bar (int c, int *p)
+{
+  int *q = p;
+
+  if (c)
+    *p = foo ();
+  else
+    *q = foo ();
+}
+
+/* { dg-final { scan-tree-dump-times "foo \\(" 1 "pre"} } */
+/* { dg-final { cleanup-tree-dump "pre" } } */

gcc/testsuite/gcc.dg/pr51879-7.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-pre" } */
+
+int bar (int);
+
+int z;
+
+void
+foo (int y)
+{
+  if (y == 6)
+    z = 5;
+  else
+    z = 5;
+}
+
+/* { dg-final { scan-tree-dump-times "z = 5" 1 "pre"} } */
+/* { dg-final { cleanup-tree-dump "pre" } } */